if (document.images) {
  preload_image_object = new Image();
  // set image url
  image_url = new Array();
  image_url[0] = "/img/solution-cellular-over.gif";
  image_url[1] = "/img/solution-patient-over.gif";
  image_url[2] = "/img/solution-cyto-over.gif";

   var i = 0;
   for(i=0; i<=3; i++) 
	 preload_image_object.src = image_url[i];
}